Why do higher mass stars live shorter lives on the main sequence than lower mass stars?
a. Higher mass stars burn through their nuclear fuel faster.
b. Lower mass stars don't get their energy from that same nuclear fusion source as higher mass stars.
c. Higher mass stars have less hydrogen fuel to burn.
d. Lower mass stars spend a longer time evolving to the main-sequence.
e. All of the above are false.
A
You might also like to view...
Answer the following statement(s) true (T) or false (F)
Which of the following pairs of forces are third-law partners? Answer T if the two forces described are third-law partners, F if they are not. 1. A thrust force from its propeller pulls a plane forward; a drag force pushes it backward. 2. A car exerts a forward force on a trailer; the trailer tugs backward on the car. 3. A motorboat propeller pushes backward on the water; the water pushes forward on the propeller. 4. Gravity pulls down on a person sitting in a chair; the chair pushes back up on the person.
What type of telescope is the Hubble Space Telescope?
A) refractor B) prime focus C) Newtonian D) Cassegrain E) Nasmyth/Coude
The figure shows a distance vs. time graph of an object with three distinct regions, I, II, and III
?
The object’s speed is greatest in region(s)
a.
I.
b.
II.
c.
III.
d.
no regions
The __________ moon is visible above the eastern horizon a couple of hours before sunrise
a. waning gibbous b. waxing gibbous c. waxing crescent d. waning crescent e. new moon